Ahli Keros was a human female servant of Brisha, and a secret member of the Reborn Sith Order. She was Ven Duaz's Sith master. When her Master and apprentice both died during the Battle of the Unknown World, Keros took Brisha's amulet and fled, using the amulet to revive the Sith Lord Darth Ruin. Keros and the remaining members of the Order came under Ruin's leadership, and they attacked the Jedi Temple on Yavin IV. During the attack, Keros was killed by Owen Skywalker, but she was later revived by Ruin, who used Darth Plagueis' teachings. However, due to her death, Keros fell out of favor with Ruin. When the Jedi escaped from Yavin IV, they captured Keros and took her with them. Keros was part of Ruin's plan to ambush the Jedi. When they landed aboard his warship, the Behemoth, she could